can you please help me understand how to customize error messages in a form with Symfony2? I want to change the HTML layout, adding div, class, etc...
Reading the guide, it gives a piece of code to put in a file called fields_errors.html.twig
but it doesn't tells where to put this file and if some extra configuration is needed.
Can somebody help me?
You have to put the template in Resourses/views/
folder of your bundle. For example,
{# Vendor/YourBundle/Resourses/views/form_fields.html.twig #}
{% extends 'form_div_layout.html.twig' %}
{% block form_errors %}
{# your form error template #}
{% endblock form_errors %}
{# other customized blocks #}
And then in your form page template,
{% extends your:page:layout %}
{% form_theme form 'VendorYourBundle::form_fields.html.twig' %}
{{ form_errors(form.field) }}
{# ..... #}
For more option and implementation reference check form theme cookbook entry and default field layout implementation
You can customise all your error messages at once in your template:
<div class="your_new_class">
{{ form_errors(form) }}
</div>
Or individually (if your field is title for example)
<div class="your_new_class">
{{ form_errors(form.task) }}
</div>
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